Portable attachment device



FIG. 1 is a perspective view of a portable attachment device showing my new design;

FIG. 2 is a top view of the device;

FIG. 3 is a left side view of the device;

FIG. 4 is a bottom view of the device;

FIG. 5 is a right side view of the device;

FIG. 6 is a front view of the device;

FIG. 7 is a rear view of the device; and,

FIG. 8 is a perspective view of a portable attachment device showing a variant of the design. 

The ornamental design for portable attachment device, as shown. 